I think I've been in that raid. That was totally hysterical ("And that will do AoE damage which the healers have to *heal*"). I love how completely, completely serious Chas sounds. It was actually making me nervous that I didn't understand it.

I roll a healing/healing spec myself, but my guess would be that hybrids didn't like the idea of announcing their MS at the beginning of the raid because (1) the want to hedge their bets, as you said, and (2) they don't want to come off as greedy jerks right at the start of every raid (I like to hide my greedy jerkitude until at least the first boss is down, personally).

Running a raid with 10 hybrids, too, would mean you're actually trying to gear up 20 characters, not 10- a very disheartening thought indeed. Perhaps it's not a thought hybrids want to remind us of right at the enthusiastic raid start.
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I'm the same- people make me nauseated, so the scrolls help. And then it just becomes background noise to all the other dross I'm auctioning anyway (and the markup on some of those suckers is waaaaaay more than 10-13 gold, making it time/cost-effective to me). The tradeoff is, of course, that I don't get to hang around on Ironforge back alleys with my Diamond-Tipped Cane.

Ha, but seriously Chas, I think that's a fantastico idea. Why not make everyone's buffs available for a price and slight utility nerf? That's the real way to bring the player, not the class.

EDIT: Plus, it would have the added benefit of forcing everyone to learn a little bit more about which classes have which buffs, thus potentially increasing our understanding of other classes (the horror, the horror!).

EDIT 2: But then you bastard Inscriptors would be making even *more* money than the rest of us!